In a surprise move, the Federal Reserve cut its benchmark interest rate by a sizable half-percentage point Tuesday in an effort to support the economy in the face of the spreading coronavirus.
Chairman Jerome Powell noted that the coronavirus "poses evolving risks to economic activity".
It was the Fed's first rate cut since last year, when it reduced its key short-term rate three times. It is also the first time the central bank has cut its key rate between policy meetings since the 2008 financial crisis and the largest rate cut since then.
Stock market averages which had fallen sharply after the opening bell, swung almost 700 points into positive territory after the Fed announcement.
Earlier on Tuesday, seven major economies pledged to use "all appropriate tools" to deal with the spreading coronavirus but announced no immediate actions.
The group of major industrial countries, referred to as the G-7, said it was "ready to take actions, including fiscal measures where appropriate, to aid in the response to the virus and support the economy".
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The joint statement from the United States, Japan, Germany, Britain, France, Italy and Canada followed an emergency conference call among the finance ministers and central bank presidents, led by Powell and US Treasury Secretary Steven Mnuchin.
The G-7 has issued similar joint statements during periods of extreme market turmoil, such as the September 11, 2001, terrorist attacks and the 2008 financial crisis.
Last week, the Dow plunged 14 per cent from recent highs, its worst week since the 2008 global financial crisis.
"Given the potential impacts of COVID-19 on global growth, we reaffirm our commitment to use all appropriate policy tools to achieve strong, sustainable growth and safeguard against downside risks," the G-7 said.
Global agencies have indicated this week that there will be a significant economic impact as the virus spreads.
On Monday, the Organisation for Economic Cooperation and Development said that the coronavirus, which was first detected in China but has now spread to 60 nations in Europe, the US, Latin America and other parts of Asia, could cause the world economy to shrink this quarter for the first time since the international financial crisis more than a decade ago.
The OECD lowered its forecasts for global growth in 2020 by half a percentage point, to 2.4 per cent and said the figure could go as low as 1.5 per cent if the outbreak is sustained and widespread. There are signs that the outbreak has begun to ebb in China.